After completing the entire book and going through the exercises I can safely say this book delivers on its promise: you will have a working game and get the basic concepts behind its construction from using the unity engine.
Now before you buy this book realize what it is NOT:
-It is not a C# or Java language book (there are many books on those)
-It is not about game design
-It is not about about modelling, texturing, or animating
-It is not a book on programming (like teaching object oriented coding)
What is this book?
-An introduction to the core features of unity (GUI, textures, assets, prefabs, particle systems, lighting, very basic animation, menus, terrain editor)
-An introduction to basic coding (and an introduction to some concepts of object oriented coding)
-An introduction to scripting using C# & Java
-A detailed step by step break down of how to make a basic adventure game on an island
-A book which gives you pre-made assets (sounds, textures, models, materials) and shows you how to work with them to create a game
This book breaks down step by step (from importing models and using textures to writing and tweaking scripts) how to create a world using the unity terrain editor and asset importer. It then walks you through how to make the player interact with objects, and create effects and triggers, detect collisions, call animations, and provide player feedback.
Coding can be intimidating but this book really keeps it simple (with few exceptions) as it explains every thing you're doing as you do it. I found it very easy to follow along with the book and my builds would come out just fine each time (and if it didn't the errors were almost always spelling mistakes).
This book will serve as a great launching pad for learning unity. If you are a programmer this is a great intro to unity. If you are new to programming, you might want to read a book on objected oriented coding before or after this book (but this book can be done by someone with 0 coding experience). If you are an artist this will definitely help you learn how to use unity and get used to the asset import options you have available.
Hope this helps
P.S. This book was written for unity 3.4 (at the time of this review the current version is 3.5.1). The particle system in the book (chapter 8) is out of date. If you go to his website, [...], he has a video which explains the new particle system (it's very easy to use).